Vent question

sparke Posted By sparke, Mar 6, 2008 at 11:52 AM

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  1. sparke

    sparke
    Minister of Fire

    Jul 6, 2006
    564
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    Loc:
    Maine
    What type of vent does a non-pressurized tank need. What is the best way to install it? I am hoping to have a good seal between the lid and the tank... Atmospheric vent?
     
  2. Nofossil

    Nofossil
    Moderator Emeritus

    Oct 4, 2007
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    Loc:
    Addison County, Vermont
    I left no space at all above the water line - my EPDM floats on the water surface, which is maybe 1/2" below the top of the tank. I did connect a pipe that runs out to the boiler room and into a 'sight glass' so that I can see the water level. Hasn't changed in two years. I'll probably open the tank this year just to see what it looks like.
     
  3. Eric Johnson

    Eric Johnson
    Mod Emeritus

    Nov 18, 2005
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    One way I've seen is a rubber ball placed on top of an open, vertical pipe. Presumably this allows air to escape, but not be drawn in. You could rig some expansion bladder like an old inner tube up to the vent pipe to keep oxygen out, I would think. Or just leave the vent open.
     
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